randolph



(No Model.)

J'. B. OLEAVER.

ACOUSTIC TELEPHONE.

No. 825,500. Patented Sept. 1, 1885.

WITNESSES c9716 @WOM fli g/32 5p ew/2 PM, v Attorney UNITED STATESPATENT OFFICE.

JOSEPH BRADFORD CLEAVER, OF NEXV YORK, N. Y.

ACOUSTIC TELEPHONE.

SPECIFICATION Application filed April 28, 1885. (No model) To all whomit may concern.-

Be it known that I, JOSEPH BRADFORD CLEAVER, of the city, county, andState of New York, have invented a new and useful Improvement inAcoustic or Mechanical Telephones; and I hereby declare the following tobe a full and clear description thereof.

This invention relates to the construction of the telephone with aseries of trussing-wires over the front face of the diaphragm, and ananchoring-disk connected therewith by short connectingwires, the saidanchoring-disk forming the anchorage proper for the linewire.

The invention will be readily understood by reference to theaccompanying drawings, of which Figure 1 is a perspective view of one ofthe improved telephones, showing its line-wire and the improvedresonance-resisting cushion. A portion of the side of the telephone-caseis broken out in this view to show the wire and cushion arrangement.Fig. 2 is a front face view of the improved telephone. Fig. 3 is asectional elevation taken on the line a; x of Fig. 2 through one of theanchoragefastenings of the diaphragm trussing-wires. Fig. at is a detailfront elevation of the cushion plate or disk, to which the linewire isanchored through a cushion, and from which short anchorage-wires extendto the trussingwires of the diaphragm. Fig. '5 is an enlarged sectionaldetail of the receiving car-tube and its attachment-piece by which it isattached to the line-wire of the telephone.

The case A has a textile fabric diaphragm, B, secured over a circularaperture made in its front face-plate, a, as in acoustic telephones nowin use. These textile diaphragms are of very thin material, andtherefore do not fur nish sufficient strength for the anchorage of theline-wire, and to provide the requisite strength of anchorage theanchorage or trussing wires 0 are drawn tightly across and close to thefront face of the diaphragm l3, and are turned down through the holes(K, in the front plate or diaphragm-frame, a, of the telephonecase, andsecured at the back of the said faceplate a. The said. anchorage-holes aare made in pairs, say a quarter of an inch apart, more or less, and thetrussing or anchorage wire is passed in through one hole of a pair andout through its mate, so that at each of these anchorages the trussingor anchorage wire C is securely attached to the said front face-plate,a. The trussingwires C are drawn tightly across the front face of thediaphragm between these anchorages a a, and the branchinganchorage-wires D are attached by their front ends to thesetrussing-wires O, and by their rear or inner ends to a small metallicdisk or cushion plate E, to which the linewire F is attached in themanner presently explained. This disk or cushion plate E has a centralaperture through which the line-wire F passes, and concentrically aroundthe said central aperture, and near the edge of the disk E and at equaldistances apart, other apertures are made for the short branching ordiverging anchorage-wires D.

A cushion, G, of india-rubber, leather, linoleum, or any equivalent orsuitable material, is placed on the center of the disk E and on the sideof the said disk next the diaphragm, and a central aperture through thiscushionpiece permits the line-wire to extend through the saidcushion-piece and be secured to the metallic anchorageplate f on theinside of the said cushion. The connecting-wires D and the attached diskE form a direct tensional connection from the diaphragm B to the nextstation, and the acoustic effects produced on or by a diaphragm soconstructed and attached are of the highest order and of great utility,and by the use of the intervening cushion G all deleterious sounds-suchas the zeolian effects of wind upon the line-wire or storms and otherforeign sounds-are excluded from the telephone.

The receiving mechanism of this telephone consists of a bulb, H, ofindia-rubber or other suitable material, and an ear-tube, I, leadingfrom the said bulb to the ear of the person receiving. The said bulb isplaced on the line-wirei. 6., the line-wire F is passed through the saidbulb from side to sideand the result of this device is a wonderfullyclear delivery of the telephonic sounds through the tube I to the ear ofthe receiver.

Having described my invention, I claim 1. An anchorage for theline-wireof an acoustic telephone, consisting of a series of trussing i3 325,5CO

The disk E, the line-wire F, anchor-plate f, and the cushion G, combinedwith the anio ehorage-wires D, trussing-wires G, and diaphragm 13,substantially as described.

J. B. OLEAVER.

or anchorage wires drawn tightly across the l 2. front face of thediaphragm and connected by means of short parallel wires with a metallicdisk of a smaller diameter tih an the diaphragm and placed behind andslightly removed from lhe diaphragm, the said snhdianietered 1netallicdisk forming the anchorage proper for the line-wire.

\Vitnesses:

M. RANDOLPH, Eur; EN n H. L. RANDOLPH.

